[DELurker]

Originally Posted by yash101

Yeah. That's totally true. However, I still have doubts on how much research was done to change the frequencies into less-used ones! Other than that, they seem quite stable!

That almost sounds like intentional trolling. However, Google and Wikipedia are your friends. Look up IEEE 802 and realize how many working groups and (therefore) people are involved in all of this...

From Wikipedia...

The industrial, scientific and medical (ISM) radio bands are radio bands (portions of the radio spectrum) reserved internationally for the use of radio frequency (RF) energy for industrial, scientific and medical purposes other than telecommunications.[1]

The ISM bands were first established at the International Telecommunications Conference of the ITU in Atlantic City, 1947. The American delegation specifically proposed several bands, including the now commonplace 2.4GHz band, to accommodate the then nascent process of microwave heating;[2] however, FCC annual reports of that time suggest that much preparation was done ahead of these presentations.[3]

From the proceedings: "The delegate of the United States, referring to his request that the frequency 2450 Mc/s be allocated for I.S.M., indicated that there was in existence in the United States, and working on this frequency a diathermy machine and an electronic cooker, and that the latter might eventually be installed in transatlantic ships and aeroplanes. There was therefore some point in attempting to reach world agreement on this subject."

Radio frequencies in the ISM bands have been used for communication purposes, although such devices may experience interference from non-communication sources. In the United States, as early as 1958 Class D Citizens Band, a Part 95 service, was allocated to frequencies that are also allocated to ISM. [1]

In the US, the FCC first made unlicensed spread spectrum available in the ISM bands in rules adopted on May 9, 1985.[4][5]

Many other countries later developed similar regulations, enabling use of this technology.[citation needed] The FCC action was proposed by Michael Marcus of the FCC staff in 1980 and the subsequent regulatory action took 5 more years. It was part of a broader proposal to allow civil use of spread spectrum technology and was opposed at the time by mainstream equipment manufacturers and many radio system operators.[6]